Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_stats.c
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1 /*- 2 * Copyright (c) 1994-1995 Søren Schmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/5.2/sys/compat/linux/linux_stats.c 122153 2003-11-05 23:52:54Z anholt $"); 31 32 #include "opt_mac.h" 33 34 #include <sys/param.h> 35 #include <sys/conf.h> 36 #include <sys/dirent.h> 37 #include <sys/file.h> 38 #include <sys/filedesc.h> 39 #include <sys/proc.h> 40 #include <sys/mac.h> 41 #include <sys/malloc.h> 42 #include <sys/mount.h> 43 #include <sys/namei.h> 44 #include <sys/stat.h> 45 #include <sys/systm.h> 46 #include <sys/vnode.h> 47 48 #include <machine/../linux/linux.h> 49 #include <machine/../linux/linux_proto.h> 50 51 #include <compat/linux/linux_util.h> 52 53 static int 54 newstat_copyout(struct stat *buf, void *ubuf) 55 { 56 struct l_newstat tbuf; 57 struct cdevsw *cdevsw; 58 dev_t dev; 59 60 bzero(&tbuf, sizeof(tbuf)); 61 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 62 tbuf.st_ino = buf->st_ino; 63 tbuf.st_mode = buf->st_mode; 64 tbuf.st_nlink = buf->st_nlink; 65 tbuf.st_uid = buf->st_uid; 66 tbuf.st_gid = buf->st_gid; 67 tbuf.st_rdev = buf->st_rdev; 68 tbuf.st_size = buf->st_size; 69 tbuf.st_atime = buf->st_atime; 70 tbuf.st_mtime = buf->st_mtime; 71 tbuf.st_ctime = buf->st_ctime; 72 tbuf.st_blksize = buf->st_blksize; 73 tbuf.st_blocks = buf->st_blocks; 74 75 /* Lie about disk drives which are character devices 76 * in FreeBSD but block devices under Linux. 77 */ 78 if (S_ISCHR(tbuf.st_mode) && 79 (dev = udev2dev(buf->st_rdev, 0)) != NODEV) { 80 cdevsw = devsw(dev); 81 if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) { 82 tbuf.st_mode &= ~S_IFMT; 83 tbuf.st_mode |= S_IFBLK; 84 85 /* XXX this may not be quite right */ 86 /* Map major number to 0 */ 87 tbuf.st_dev = uminor(buf->st_dev) & 0xf; 88 tbuf.st_rdev = buf->st_rdev & 0xff; 89 } 90 } 91 92 return (copyout(&tbuf, ubuf, sizeof(tbuf))); 93 } 94 95 int 96 linux_newstat(struct thread *td, struct linux_newstat_args *args) 97 { 98 struct stat buf; 99 struct nameidata nd; 100 char *path; 101 int error; 102 103 LCONVPATHEXIST(td, args->path, &path); 104 105 #ifdef DEBUG 106 if (ldebug(newstat)) 107 printf(ARGS(newstat, "%s, *"), path); 108 #endif 109 110 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, path, td); 111 error = namei(&nd); 112 LFREEPATH(path); 113 if (error) 114 return (error); 115 NDFREE(&nd, NDF_ONLY_PNBUF); 116 117 error = vn_stat(nd.ni_vp, &buf, td->td_ucred, NOCRED, td); 118 vput(nd.ni_vp); 119 if (error) 120 return (error); 121 122 return (newstat_copyout(&buf, args->buf)); 123 } 124 125 int 126 linux_newlstat(struct thread *td, struct linux_newlstat_args *args) 127 { 128 int error; 129 struct stat sb; 130 struct nameidata nd; 131 char *path; 132 133 LCONVPATHEXIST(td, args->path, &path); 134 135 #ifdef DEBUG 136 if (ldebug(newlstat)) 137 printf(ARGS(newlstat, "%s, *"), path); 138 #endif 139 140 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, path, 141 td); 142 error = namei(&nd); 143 LFREEPATH(path); 144 if (error) 145 return (error); 146 NDFREE(&nd, NDF_ONLY_PNBUF); 147 148 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 149 vput(nd.ni_vp); 150 if (error) 151 return (error); 152 153 return (newstat_copyout(&sb, args->buf)); 154 } 155 156 int 157 linux_newfstat(struct thread *td, struct linux_newfstat_args *args) 158 { 159 struct file *fp; 160 struct stat buf; 161 int error; 162 163 #ifdef DEBUG 164 if (ldebug(newfstat)) 165 printf(ARGS(newfstat, "%d, *"), args->fd); 166 #endif 167 168 if ((error = fget(td, args->fd, &fp)) != 0) 169 return (error); 170 171 error = fo_stat(fp, &buf, td->td_ucred, td); 172 fdrop(fp, td); 173 if (!error) 174 error = newstat_copyout(&buf, args->buf); 175 176 return (error); 177 } 178 179 /* XXX - All fields of type l_int are defined as l_long on i386 */ 180 struct l_statfs { 181 l_int f_type; 182 l_int f_bsize; 183 l_int f_blocks; 184 l_int f_bfree; 185 l_int f_bavail; 186 l_int f_files; 187 l_int f_ffree; 188 l_fsid_t f_fsid; 189 l_int f_namelen; 190 l_int f_spare[6]; 191 }; 192 193 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 194 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 195 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 196 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 197 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 198 #define LINUX_NCP_SUPER_MAGIC 0x564cL 199 #define LINUX_NFS_SUPER_MAGIC 0x6969L 200 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 201 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 202 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 203 204 static long 205 bsd_to_linux_ftype(const char *fstypename) 206 { 207 int i; 208 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 209 {"ufs", LINUX_UFS_SUPER_MAGIC}, 210 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 211 {"nfs", LINUX_NFS_SUPER_MAGIC}, 212 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 213 {"procfs", LINUX_PROC_SUPER_MAGIC}, 214 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 215 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 216 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 217 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 218 {"coda", LINUX_CODA_SUPER_MAGIC}, 219 {NULL, 0L}}; 220 221 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 222 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 223 return (b2l_tbl[i].linux_type); 224 225 return (0L); 226 } 227 228 int 229 linux_statfs(struct thread *td, struct linux_statfs_args *args) 230 { 231 struct mount *mp; 232 struct nameidata *ndp; 233 struct statfs *bsd_statfs; 234 struct nameidata nd; 235 struct l_statfs linux_statfs; 236 char *path; 237 int error; 238 239 LCONVPATHEXIST(td, args->path, &path); 240 241 #ifdef DEBUG 242 if (ldebug(statfs)) 243 printf(ARGS(statfs, "%s, *"), path); 244 #endif 245 ndp = &nd; 246 NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, path, td); 247 error = namei(ndp); 248 LFREEPATH(path); 249 if (error) 250 return error; 251 NDFREE(ndp, NDF_ONLY_PNBUF); 252 mp = ndp->ni_vp->v_mount; 253 bsd_statfs = &mp->mnt_stat; 254 vrele(ndp->ni_vp); 255 #ifdef MAC 256 error = mac_check_mount_stat(td->td_ucred, mp); 257 if (error) 258 return (error); 259 #endif 260 error = VFS_STATFS(mp, bsd_statfs, td); 261 if (error) 262 return error; 263 bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 264 linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 265 linux_statfs.f_bsize = bsd_statfs->f_bsize; 266 linux_statfs.f_blocks = bsd_statfs->f_blocks; 267 linux_statfs.f_bfree = bsd_statfs->f_bfree; 268 linux_statfs.f_bavail = bsd_statfs->f_bavail; 269 linux_statfs.f_ffree = bsd_statfs->f_ffree; 270 linux_statfs.f_files = bsd_statfs->f_files; 271 if (suser(td)) { 272 linux_statfs.f_fsid.val[0] = 0; 273 linux_statfs.f_fsid.val[1] = 0; 274 } else { 275 linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 276 linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 277 } 278 linux_statfs.f_namelen = MAXNAMLEN; 279 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 280 } 281 282 int 283 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args) 284 { 285 struct file *fp; 286 struct mount *mp; 287 struct statfs *bsd_statfs; 288 struct l_statfs linux_statfs; 289 int error; 290 291 #ifdef DEBUG 292 if (ldebug(fstatfs)) 293 printf(ARGS(fstatfs, "%d, *"), args->fd); 294 #endif 295 error = getvnode(td->td_proc->p_fd, args->fd, &fp); 296 if (error) 297 return error; 298 mp = fp->f_vnode->v_mount; 299 #ifdef MAC 300 error = mac_check_mount_stat(td->td_ucred, mp); 301 if (error) { 302 fdrop(fp, td); 303 return (error); 304 } 305 #endif 306 bsd_statfs = &mp->mnt_stat; 307 error = VFS_STATFS(mp, bsd_statfs, td); 308 if (error) { 309 fdrop(fp, td); 310 return error; 311 } 312 bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 313 linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 314 linux_statfs.f_bsize = bsd_statfs->f_bsize; 315 linux_statfs.f_blocks = bsd_statfs->f_blocks; 316 linux_statfs.f_bfree = bsd_statfs->f_bfree; 317 linux_statfs.f_bavail = bsd_statfs->f_bavail; 318 linux_statfs.f_ffree = bsd_statfs->f_ffree; 319 linux_statfs.f_files = bsd_statfs->f_files; 320 if (suser(td)) { 321 linux_statfs.f_fsid.val[0] = 0; 322 linux_statfs.f_fsid.val[1] = 0; 323 } else { 324 linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 325 linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 326 } 327 linux_statfs.f_namelen = MAXNAMLEN; 328 error = copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 329 fdrop(fp, td); 330 return error; 331 } 332 333 struct l_ustat 334 { 335 l_daddr_t f_tfree; 336 l_ino_t f_tinode; 337 char f_fname[6]; 338 char f_fpack[6]; 339 }; 340 341 int 342 linux_ustat(struct thread *td, struct linux_ustat_args *args) 343 { 344 struct l_ustat lu; 345 dev_t dev; 346 struct vnode *vp; 347 struct statfs *stat; 348 int error; 349 350 #ifdef DEBUG 351 if (ldebug(ustat)) 352 printf(ARGS(ustat, "%d, *"), args->dev); 353 #endif 354 355 /* 356 * lu.f_fname and lu.f_fpack are not used. They are always zeroed. 357 * lu.f_tinode and lu.f_tfree are set from the device's super block. 358 */ 359 bzero(&lu, sizeof(lu)); 360 361 /* 362 * XXX - Don't return an error if we can't find a vnode for the 363 * device. Our dev_t is 32-bits whereas Linux only has a 16-bits 364 * dev_t. The dev_t that is used now may as well be a truncated 365 * dev_t returned from previous syscalls. Just return a bzeroed 366 * ustat in that case. 367 */ 368 dev = makedev(args->dev >> 8, args->dev & 0xFF); 369 if (vfinddev(dev, VCHR, &vp)) { 370 if (vp->v_mount == NULL) 371 return (EINVAL); 372 #ifdef MAC 373 error = mac_check_mount_stat(td->td_ucred, vp->v_mount); 374 if (error) 375 return (error); 376 #endif 377 stat = &(vp->v_mount->mnt_stat); 378 error = VFS_STATFS(vp->v_mount, stat, td); 379 if (error) 380 return (error); 381 382 lu.f_tfree = stat->f_bfree; 383 lu.f_tinode = stat->f_ffree; 384 } 385 386 return (copyout(&lu, args->ubuf, sizeof(lu))); 387 } 388 389 #if defined(__i386__) 390 391 static int 392 stat64_copyout(struct stat *buf, void *ubuf) 393 { 394 struct l_stat64 lbuf; 395 struct cdevsw *cdevsw; 396 dev_t dev; 397 398 bzero(&lbuf, sizeof(lbuf)); 399 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 400 lbuf.st_ino = buf->st_ino; 401 lbuf.st_mode = buf->st_mode; 402 lbuf.st_nlink = buf->st_nlink; 403 lbuf.st_uid = buf->st_uid; 404 lbuf.st_gid = buf->st_gid; 405 lbuf.st_rdev = buf->st_rdev; 406 lbuf.st_size = buf->st_size; 407 lbuf.st_atime = buf->st_atime; 408 lbuf.st_mtime = buf->st_mtime; 409 lbuf.st_ctime = buf->st_ctime; 410 lbuf.st_blksize = buf->st_blksize; 411 lbuf.st_blocks = buf->st_blocks; 412 413 /* Lie about disk drives which are character devices 414 * in FreeBSD but block devices under Linux. 415 */ 416 if (S_ISCHR(lbuf.st_mode) && 417 (dev = udev2dev(buf->st_rdev, 0)) != NODEV) { 418 cdevsw = devsw(dev); 419 if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) { 420 lbuf.st_mode &= ~S_IFMT; 421 lbuf.st_mode |= S_IFBLK; 422 423 /* XXX this may not be quite right */ 424 /* Map major number to 0 */ 425 lbuf.st_dev = uminor(buf->st_dev) & 0xf; 426 lbuf.st_rdev = buf->st_rdev & 0xff; 427 } 428 } 429 430 /* 431 * The __st_ino field makes all the difference. In the Linux kernel 432 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 433 * but without the assignment to __st_ino the runtime linker refuses 434 * to mmap(2) any shared libraries. I guess it's broken alright :-) 435 */ 436 lbuf.__st_ino = buf->st_ino; 437 438 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 439 } 440 441 int 442 linux_stat64(struct thread *td, struct linux_stat64_args *args) 443 { 444 struct stat buf; 445 struct nameidata nd; 446 int error; 447 char *filename; 448 449 LCONVPATHEXIST(td, args->filename, &filename); 450 451 #ifdef DEBUG 452 if (ldebug(stat64)) 453 printf(ARGS(stat64, "%s, *"), filename); 454 #endif 455 456 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, filename, 457 td); 458 error = namei(&nd); 459 LFREEPATH(filename); 460 if (error) 461 return (error); 462 NDFREE(&nd, NDF_ONLY_PNBUF); 463 464 error = vn_stat(nd.ni_vp, &buf, td->td_ucred, NOCRED, td); 465 vput(nd.ni_vp); 466 if (error) 467 return (error); 468 469 return (stat64_copyout(&buf, args->statbuf)); 470 } 471 472 int 473 linux_lstat64(struct thread *td, struct linux_lstat64_args *args) 474 { 475 int error; 476 struct stat sb; 477 struct nameidata nd; 478 char *filename; 479 480 LCONVPATHEXIST(td, args->filename, &filename); 481 482 #ifdef DEBUG 483 if (ldebug(lstat64)) 484 printf(ARGS(lstat64, "%s, *"), args->filename); 485 #endif 486 487 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, filename, 488 td); 489 error = namei(&nd); 490 LFREEPATH(filename); 491 if (error) 492 return (error); 493 NDFREE(&nd, NDF_ONLY_PNBUF); 494 495 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 496 vput(nd.ni_vp); 497 if (error) 498 return (error); 499 500 return (stat64_copyout(&sb, args->statbuf)); 501 } 502 503 int 504 linux_fstat64(struct thread *td, struct linux_fstat64_args *args) 505 { 506 struct filedesc *fdp; 507 struct file *fp; 508 struct stat buf; 509 int error; 510 511 #ifdef DEBUG 512 if (ldebug(fstat64)) 513 printf(ARGS(fstat64, "%d, *"), args->fd); 514 #endif 515 516 fdp = td->td_proc->p_fd; 517 if ((unsigned)args->fd >= fdp->fd_nfiles || 518 (fp = fdp->fd_ofiles[args->fd]) == NULL) 519 return (EBADF); 520 521 error = fo_stat(fp, &buf, td->td_ucred, td); 522 if (!error) 523 error = stat64_copyout(&buf, args->statbuf); 524 525 return (error); 526 } 527 528 #endif /* __i386__ */
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